In the Bohr model of the hydrogen atom, a single electron revolves around a single proton in a circle of radius Assume that the proton remains at rest. (a) By equating the electric force to the electron mass times its acceleration, derive an expression for the electron's speed. (b) Obtain an expression for the electron's kinetic energy, and show that its magnitude is just half that of the electric potential energy. (c) Obtain an expression for the total energy, and evaluate it using Give your numerical result in joules and in electron volts.